Cognitive Relay Networks With Multiple Primary Transceivers Under Spectrum-Sharing

Abstract-We consider a spectrum sharing scenario, where a secondary network coexists with a primary network of multiple transceivers. The secondary network consists of an energyconstrained decode-and-forward secondary relay which assists the communication between a secondary transmitter and a destination in the presence of the interference from multiple primary transmitters. The secondary relay harvests energy from the received radiofrequency signals, which include the information signal from the secondary transmitter and the primary interference. The harvested energy is then used to decode the secondary information and forward it to the secondary destination. At the relay, we adopt a time switching policy due to its simplicity that switches between the energy harvesting and information decoding over time. Specifically, we derive a closed-form expression for the secondary outage probability under the primary outage constraint and the peak power constraint at both secondary transmitter and relay. In addition, we investigate the effect of the number of primary transceivers on the optimal energy harvesting duration that minimizes the secondary outage probability. By utilizing the primary interference as a useful energy source in the energy harvesting phase, the secondary network achieves a better outage performance.

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“…Substituting I along with J from (27) and P H1 from (28) in (26), we get the required closed-form expression of CDF of γ SD as in (18).…”

Section: Discussionmentioning

confidence: 99%

Interference-Assisted Wireless Energy Harvesting in Cognitive Relay Network with Multiple Primary Transceivers

Kalamkar

Banerjee

2015

2015 IEEE Global Communications Conference (GLOBECOM)

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“…where I p denotes the interference tolerable interference power at the primary receiver and P m is the maximum transmission power, leading to the instantaneous SNR as follows [40]:…”

Section: Average Bep Of Cognitive Underlay Networkmentioning

confidence: 99%

A Survey on Approximations of One-Dimensional Gaussian Q-Function

Bao

Tuyen

Tue

2016

REV-JEC

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Abstract-Predicting the digital communication system performance plays a very important role in the process of system design. This performance is usually quantified by symbol error probability or bit error probability. Computing these probabilities in presence of Additive White Gaussian Noise requires to work with integrals involving the Gaussian Qfunction, which cannot be expressed in closed-form in terms of elementary functions. As a result, approximating the Gaussian Q-function in closed-form expressions with high accuracy becomes a necessity. In this paper, we give an overview about the Gaussian Q-function approximations and via some illustrating examples, we discuss their accuracy, tractability as well as their computational complexity.

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“…Thus, with the consideration of PT's interference, the exact and asymptotic outage probabilities of CRNs with single-relay over Rayleigh fading are derived in [10]. Moreover, the interference constraint from PR and the interference of PT are extended from single user to multiple users in [11], wherein three key constraints are considered, namely, the maximum powers of CUs, the peak interference powers at multiple PRs and the interference of multiple PTs.…”

Section: Introductionmentioning

confidence: 99%

“…Different from [6][7][8][9][10][11] that focus on the underlay CRNs with only one source-destination pair and with single-relay or multi-relay, the following works pay attention to the case of CRNs with multi-destination over Nakagami-m fading. Specifically, without the consideration of PT's interference, the outage performances of CRNs with single-relay under the interference constraints from multiple PRs, and with multi-relay under the interference constraint from one PR are investigated in [12,13], respectively.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to the above works [3][4][5][6][7][8][9][10][11][12][13][14] that focus on dual-hop CRNs, a more general scenario of multihop CRNs is receiving more attention, since multihop relaying is an efficient strategy to save power, and improve connectivity or coverage. In [15], under the interference constraint from one PR, the outage performance of multihop CRNs with imperfect channel state information (CSI) over Nakagami-m fading is investigated.…”

Section: Introductionmentioning

confidence: 99%

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Joint Spatial-Temporal Access Scheme for Multihop Cognitive Relay Networks Over Nakagami-m Fading

Zheng

Liang

et al. 2017

Wireless Pers Commun

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This paper investigates the cooperative multihop cognitive relay networks (CRNs) under a novel two-dimensional spatial-temporal opportunity model, in which free opportunity and sharing opportunity are defined to enhance the spectrum efficiency. Correspondingly, a joint spatial-temporal access scheme (JSTAS) is proposed to realize successive spectrum access for continuous data transmission. The multihop CRNs with fixed relaying employ decode-and-forward with and without signal-to-noise ratio selection, which are named as SDF and DF, respectively. Then, considering the interference constraints from multiple primary receivers, the interference of one primary transmitter and the maximum transmit powers of cognitive users, we study the outage performance of multihop CRNs with JSTAS over Nakagami-m fading. To comprehensively evaluate JSTAS, we further present the pure spatial access scheme (SAS) and the pure temporal access scheme (TAS) under the spatial-temporal opportunity model, and calculate their average network outage probabilities. Simulation results demonstrate that SDF outperforms DF, while JSTAS outperforms SAS and TAS under all considered scenarios.

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Cognitive Relay Networks With Multiple Primary Transceivers Under Spectrum-Sharing

Cited by 136 publications

References 8 publications

Interference-Assisted Wireless Energy Harvesting in Cognitive Relay Network with Multiple Primary Transceivers

Interference-Assisted Wireless Energy Harvesting in Cognitive Relay Network with Multiple Primary Transceivers

A Survey on Approximations of One-Dimensional Gaussian Q-Function

Joint Spatial-Temporal Access Scheme for Multihop Cognitive Relay Networks Over Nakagami-m Fading

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